Does anyone have that graph that shows the cost of a lumen over history? I found one in a PDF but it only goes to 2011.
The one I'm trying to find maps a dramatic increase in price per lumen when considering IoT enabled "smart" lights (requiring datacenters and the whole clowncar of dependencies the cloud requires).
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@cooler_ranch I think Hans Rosling was looking at it in his book, maybe something on his GapMinder website
@kravietz Thanks for the lead :D